Paperboard container and method of making same



Oct. 1, 1940. J. WEISS El Al, 2,216,527

PAPERBOARD CONTAINER AND METHOD OF MAKING SAME Filed Aug. 23, 1938 ree d- 1, f 2116. 27/

UNITED STATES; PATENT 'orr cg v I I PAPERBOARD CONTAINER AND METHOD OF I IMAKINGSAME Arthur J. Weiss,Englewood, N. J ,andHar-ry vJ. Rossi, Bronx, N. Y., assignors' to Robert Gair Company, IncsNew York; N. Y., a corporation 7 of Delaware i I Application August 23, 1938, Serial No.- 226,226

g I 15 Claims. (01. 2295-14) p I The present invention relates to an improve? of the top end of thebag and container closure, ment in paperboard cartons and is especially dipartially fragmented, showing the position -.of-f

rected to a Collapsible or knock-down cartonin. the coacting parts, asdisclosed'in :Fig. 8; I which an inner, waterproof liner is used to en.- Fig. 'll-is, a fragmentary plan view of -the top 5 able the package to be used for holding, shipping portions'ofFig; 2, closed;,' I a I and dispensing liquids, frozen foodproducts and Fig. -12 is a blank layout of a modified formof' I I other articles of commerce. I j

carton, blank, underlaid by a flat liner-forming Another featureof advantage lies inthe methblank; and y 0d of introducing the linerinto thecarton, filI-. Fig. 13: is an enlarged, transverse, 866110113111 0 ing, closingv and sealing the liner, to efiect a view of 'the'blank of Fig.i12,,after foldingpandliquid-tight closureof the liner, after filling. The before final gluing. present improved carton may be used: to package The blank of the container as shown in Fig. 1-,- any material or liquid, other, than those above, comprises two body-forming front and qrear indicated, but the special use for theherein carpanels 4 and-2. respectively, separated from each 15 ton is for liquids. I

other by a body-forming'side panelil-byscor'e 15 ,Another feature ofadvantageliesin the cooplines 0' and,d. Panel 4 at oneend carries afold eration of theliner mouth andtheclosing means. I able'closing'flap 22, defined therefromby: a -comof the carton, as will hereinafter appearin demon. score line e, saidqfiapQ22 having anextendtail, to obtain a closure whereby to mechanically ing latch tongue T at its outer .edge; V

reinforce the liner mouth against hydrostatic vFront body-forming panel], has :also, at its 20 bursting pressure, to prevent its accidental rupopposite end a foldabletop end closing flap Ii, ture. V I defined from panel 4 by a 'common score line I,

One of the cartons herein shown, is similar said flaphaving a latching spring. slit S within to the carton shown in the pending U. S. patent its confines,- to coact' withv locking tongue Tqon I 25 application Serial No. 197,973, filed March 25, panelZ, when this end;of the container, is snap-"25 1938, in the name of Arthur J Weiss, but the closed, to form a top end locking closurel for thecoa ction of said carton, in thepresent disclosure, container. I r I effects. a method of sealing a. lined container The side-formingpanel 3 has on its opposite therein, which is novel andeffe'ctive. V I ends, Fig; l, diagonallyscored, inclosing, 'fold- The foregoing and other features of advanable end flaps, ll5,-l6 and-,,20--2l, 'theyflapto. tage will be apprehended as the herein descrip- 2fl,2l,-being a bottomclosing, diagonally scored tion proceeds, and it will be obviousthatmodimember, and being defined'from panel ,3 by the flcations may be made in the structures and steps common score line e. Flap 202l is traversed of procedure, as herein disclosed, without deby'the single diagonal scored folding line It. The

parting from the spirit hereof or the scope of opposite :end -ofv the top forming 'infolding flap 35 v the appendedclaims. I I ll5l6, which is defined; from panel 3 by the In the drawing, I I common score line i, is traversedby two diagonal Fig. 1 is a flat layout of one form ofblankused fold lines i and; a, which define a triangular or in forming the carton of the herein improveinfolding bellows fold, formed by the triple tri-- 40 ment; I t I angular sub-flaps 1 -l5 -l6. I I I -4 I Fig. 2 is a perspective view of. the carton of Main front-forming body panel 2, at its bottom J Fig. 1, partially assembled with its bag-like liner, end closure, portion is provided with an ,end clos-i with parts broken away for better understanding flap l9, which is defined from front-forming, I panel 2, by common score line e, and is defined Fig. 3 is a perspective view of one form of the from diagonal side closing sub fiaps 20-2! and 1 bag-liner, before introduction into the carton or I l-'I8, by folding score'lines c and b, respeccontainer; V tively. End closing flap IS-is also provided with Fig. 4 is a bottom view of the container of a latch spring slit'S', to'co'act with tongue ex Fig. 2, closed; I I I tension T, when the bottom is closed.

Fig. 5 is .a fragmentary side view of the bottom The opposite top end'of rear panel 2 is pro- 50 of the container of Figs.2 and 4, shownclosed; vided with a liner-clasping top end closing flap" Figs. 6, '7, 8 and 10 are fragmentary side views, 8-9-40, this being defined from front panel 2 in elevation of the top closure of the bag-liner by common score line I, this, in turn being.v and carton in successive steps of closing; traversed by folding score lines h, f andf", the

53 Fig. 9 is a fragmentary view in front elevation, lines j and being interrupted at their mid- 55 section by acut spring latch T, which coordinates with the snap latch slit S to lock the upper or top end of the container when the flaps are closed. The score lines It and f'f" run parallel with score line f.

The side-forming body panel I is defined from the rear body-forming panel 2, by a score line b, and this side-forming panel 'is'provided at its opposite ends by diagonal andbellows-likeend closing flaps II-I8 and II-I3-I4, which are similar to those described for side-forming panel 3. Bellows-forming inclosing endfiap I; I--I3--|4 is defined from panel I by the common score line J, and it is provided with triangular score lines o and p, and at the opposite end thereof the in-,

folding flap II--I8 is provided with a singlediagonal score line r, said fiap I'l-I8 being defined from panel I by score line e.

There is further provided on the blank, Fig. '1, a glue lap 5, this being defined from panel I by a score line a. One end of flap 5, at f, extends over and is defined from flap l3 by common score .collapsible, erectable container, the glue lap 5,

- is folded upwardly, as viewed in Fig; l, on score linea, and then downwardly upon the face of side panel I, and the exposed face of lap S is then glued, and the panels 3 and 4 are bent up wardly and downwardly 'on score line 0, as viewed in Fig. 1, and the lap 5'v is glued to the exposed marginal edge of panel' 4. The container so formed is then ready to ship, knocked down, to the goods manufacturer, to be erected, filled and sealed, and thence shipped to the distributor, for

eventualsale to the consumer.

,After the manufacturer receives the packages, he erects the container, by first opening it to a rectangular position, on' the score lines 'a,b, c and d, then the bottom is closed by bending inwardly, simultaneously, the end closing flaps Il-Ifl and 20 -2I. This action draws the end flap I9 to closing position, and then the flap 22.

is in'foldedtand pressed downwardly until the tongue T snaps into the tongue latching slit S'( may be of any suitable pliable material, such as a waxed paper, but preferably it is made up of a clear'cellulosic pliable materiahwhich may be madequp in the form of an open ended bag,'as shown in Fig. 3, with bellows-folded sides B-B, whichare infolded to enable the bag to be shipped fiat, in packages, the bottom E of the bag being sealed'shut. I w

The bag is inserted in the outer container, as indicated in Fig. 2, leaving an upwardly externally extending end G, and is then opened, and filled with a sufficient quantity of desired material or liquid, the bag illustrated being so made as to be liquid and leak proof.

The next action is to close the bag and container simultaneously, to effect a liquid and leak proof sealing of the bagmouth, and to finally interengage and lock the extending bag mouth by infolding the ,bag mouth with the portion l0, and then completing this enclosure by latch looking. It makes no difference in, the final mouth sealing and locking, whether the steps about to be described are performed by hand or by an automatic sealing device, but it is intended to fiaps, which form the'sub-fiaps perform all of the erecting, lining and container closing by a. machine devised for this purpose.

After the bag has been inserted in the container and filled, the opposed top, main end closing fiaps 6-8 are simultaneously moved inwardly towards meeting position by simultaneously pressing the opposed flaps I and II towards each other. Owing to triangular scoring on these I5I6 and I3--I4, this action causes the flaps 1 and I I to close in the top end of the bag and reforms the bellows-fold Bot bag'on both sides, as illustrated 'in' Figs. 2 and 6, and, at the same time, to draw the opposedfiaps 6 and 8 toward each other,

this step also gradually bringing the open sides of the bag together, until finally, when this first step of closure is completed, the bag mouth is pinched shut, as shown in Fig. 7, the outer edge of the fiap 6 and the folded edge formed by score line h, fiap 9I0 being bent backwardly on the line h, and the flaps 6, I, B and II then act as pincers to hold the bag mouth closed on all four sides, with theexposed compressed portion G thereof extending above the confines of the closed flaps '6 and 8. After this step has been' performed the" closed bag mouth G, Fig. '7, is

' then tightly sealed by pressing opposed heater jaws H-H on opposite'sides of the closed mouth end. These jaws are electrically heated, and when applied under heat, cause a cement, previously applied to the inner faces of 'the bag mouth, to soften and then to set,-l'eaving the bag mouthcompletely sealed in a liquid-proof man ner.- After the cement has been softened, the

edge h-of flap 8 and theedge of fiap 6, retain the seal cemented bag mouth until the cement has set. After'the cement has set, for the final closing of the top to lock the closureandto' reinforce the cemented seal against rupture, the

fiap portion 9-10 is bent up parallel with the upstanding bag mouth G, Figs. 8 and 9, and the top portion of the bag mouth is folded and creased into an end lap G, and the flap portion I is folded thereover on score h, leaving the latch tongue T, upstanding. Then the fiap 8-9 is foldeddown onto flap 6, thus providing a second fold crease and the flap 8!! is then pressed downwardly, springing the top closure flaps 8-9-|0 and 6, until the latch tongue T springs or snaps under and into the 'slitted latch locking member S, as shown in Figs. 10 and 11, thus locking the 'top end closing flaps over the cemented bag mouth.

When and after the carton is erected, the webs I'I, I8 and 20, 2| form a support for the flaps I 9 and' 22; and the tongue T will snap under the tongue S when the flap 22 is pressed on the flap I9. Said webs form a support cooperating with said inner flap I9 to prevent accidental depression of the flaps I9, 22 and to hold both flaps in normal latching position, and to prevent" excessive undesired depression of the inner flap during said snapping.

In Fig. 12'there is shown a fiat, paperboard blank for creating a slightly modified form of container. The blank is shown in full lines, and is underlaid by a registered, rectangular sheet of cellulosic liner-forming material C which may be affixed to the underface of the blankby gluing if desired. The container blank comprises two front-and rear forming'panels 4 and 2, respectively which are defined from one another by being scored from anintermediate side-forming panel 3, by score lines'd and 0, respectively. Front body panel 4 is providedwith opposed end flaps 6-4, which are defined therefrom by common score lines and e. The said flaps are provided with slitted latch tongues S-- S.

Side forming panel 3 is provided at eachof its opposite ends with. infolding top end. closing with triangular score lines '0' and p, thus provid ing triangular sub-flaps l5, l6 and 1.: These webbed flaps l-l61 are;defined from panel 4 by common score lines I and e, and when in-' folded. form connected bellows-like pleated flaps. Rear-body-forming main panel-lie defined from the side-forming panels I and 3, by score lines D and c, respectivelyeand on each of its opposite ends is provided with composite infolding endclosing flaps 8 9l0, said flaps being defined ffr'ompanel, 2 by common score lines 1 and e. These closing flaps are traversed by a score line h, which is parallel to line I, to define sub-flap s from sub-flap 9, and sub-flap 8 is defined from sub-flap in by score lines I. and 1", intermediate of which islocated a slitted cut spring latch tongue '1. Y

Side-forming panel I is defined from rear panel 2 by. a score line b and is defined from the glue lap 5 by score line. a. Panel .1 is provided at its opposite ends with bellows-like end closing, flaps ll--l3--l4 which are defined from panel by. common score lines 1 and;e,= andare defined fromeachother by diagonal score lines op, to form connected sub-flaps lI,--l3 and I4. These flaps when the container is erected, are opposed. to the flaps ,l-l5l6, and they function the same as said latter flaps, as will belaterydisclosed in detail.

Glue lap 5 is more extensive than the glue lap 5 of Fig. l., and is provided with rectangular corner overlaps l2 at its opposite ends these being defined by common score lines 1, e and a.

The cellulosic liner sheet C, Fig. 12,.is fiatgand.

' not in a pre-formedbag structure as shown in- Fig. 3, and as seen in Fig. 12, the sheetis slightly narrower than the length of panel 2 and its flaps In, and length-wise it terminates at aboutthe mid-section of glue lapi, and at its opposite end extends beyond; the limits of the blank-thus to' form a marginal extension aroundthe edgesof panelsBandl.

In assembling anderecting the container from the blank of Fig. 12, after theblank has the cellulosic sheet liner adhered thereto, the blank and sheet liner C, are then turnedover to expose the lined blanksurface face upwards,,then glue is applied to the liner margin which covers the I glue lap -5 and the glue lap margin t, .and glue is also applied to the marginal facem Of' the liner at its opposite end, the panels 4-3 are then bent upward on score line 0, and then bent down until the liner portion on panels 43 comes into.- Then contact withthe liner face of panels 'l2. the glue lap; 5 is bent upwardly and over and downwardly to bring its glued liner and flap,

portion t. into over-folded contact with-the glued liner margin m and the, marginal edge of panel 4,v as illustrated in the enlarged sectional view shown in Fig. 13, wherein the overlap described is shown before the final seal. 1 v

This structural assembly of the inner and container blanks lines the inner face of the con tainer with a perfectly sealed, leak-proof inner.

liner, the jointureat the overlappedportions of the marginallyadhered liner edgesandthe container-lap'adherence forming an impervious joint. The liner, as above described, forms an open ended, tubular formation; both ends beingopen,

of Fig. 2.

and as the container is initially made fiat, being folded on its .s core lines a-and c, the container is thus erectable as'described for the container After the erection of, the blank into rectangular container form, the and closing flaps and extended liner ends are closed and sealed in a manner exactly as describedfor the container of Fig, 1, In the erectedcontainerof Fig. 12, because of the, similarity of; the'end closing flapsthereon, either-end may be top or bottom.

ll-ua-qtand 1-15-15, are infolded simul ta neously, and this action'simultaneously draws down the closingxflaps 8+9 l0, and this action after folding-the portions 9 outwardly on score line h, shownin Fig. 7-, and from then on the'seouence of steps of heat-sealing and final latching closure, after fillingis identical with the steps shown in Figs. -7, 8, 9, l0 and 11. Aswill be apprehendedboth ends of the container of Fig. 12 are identically. constructed and closed. This container, like the one shown in Fig.3, is susceptible of either manual, or machine-actu ated, filling, heat-sealing and closing. i

Having thus described theinvention claimed is: 1. A carton comprising opposite panels; .inner and outerflaps foldably joining thepanels, the inner fiap extending partly across the carton; the outer iiap having a fold line within and along the outer margin; anda liner for said carton what i having a closure portion received ;between, said flaps and against the outer margin'of theouter an i flap; said portion-and outer, margin being folded' along thefold line in'a position under the outer flap.

2. A carto n comprising an outer flap havinga fold line; and a linerfor said carton having a closure portion received against the inner face of the flap; said portion and the part of thefiap 1 beyond the fold line being folded together along the fold linein a position under the outer flap."

-3. A carton-comprising opposite panels; inner;

and outer flaps foldably joining the panels; :the inner flap extending partly across=the-carton and provided with. a slit forming alongitudinallatch:

edge; the outer flap .-having a slit forming .an outwardly projected: longitudinal latch tongue; a liner for said carton, the upper portion thereof being folded flat and disposed between said flaps and against the outer margin of the outerfiapy said portion andouter margin'being folded along a longitudinal line under the outer flap, disposed toleavethe latch tongue-projected to engage,

under said latchingedge. a I

.- 4, A carton comprising opposite panels; inner and outer flaps foldably joining the panels, the

inner flap extending partly-l across the carton; theinner fiap being providedwith a slit forming alongitudinallatch edge; the outer flap having; antinner fold line substantiallyalong the free; edge of theinner flap, and; having a slit forming i an outwardly projectedlongitudinal latch tongue,

and alined longitudinal fold lines joining the slit;

a liner for said carton,,the upper portion thereof a being highenough, when-said portion andfiaps are upright, toproject beyond said alined fold lines; said portion of the liner being received, between said inner fold line and the inner flap and against-theouteri margin of the outcr flap saidportion and outer margin being folded-along:

the alined fold lines in a position under the outer flap, leaving the latch tongue projected and engaged under said latching edge.

5. A carton comprising opposite main panels;

ing the ends of the slit, whereby the margin may be turned under jected. p

6. A carton as in claim having a liner for said carton, the upper portion thereof being high enough to project beyond -said alined fold lines when the outer flap is upright; whereby when portions of the adjacent liner are folded inwardly and said flaps are drawn downward, said upper portion will be received between said'inner fold line and the inner flap, against the outer margin of the outer flap and is foldable with said outer margin along the alined fold lines to a position und'erthe outer flap, leaving the latch tongue projected to engage under said latching edge.

7. A carton comprising opposite main panels; spacingpanels.therebetween; inner and outer flaps foldably joining the main panels, the inner flap being adapted to extend half across the carton; web extensions foldably joining the ends the flap,l e'aving the latch proof the flaps-and the spacing panels respectively;

and each being divided into triangular middle and end sections which fold inwardly horizontally fiat'upon each other;'the inner flap being provided near its mid-part'with a slit forminga longitudinal latch edge; the outer flap having an inner fold line along the middle axis of the top of the carton, and having, at the mid-portion of its free margin, a slitforming an outwardly disposed latch tongue; and alined longitudinal fold lines joining the ends of the slit, wherebythe margin may be turned under theiiap, leaving the latch projected.

8. A carton as inclaim '7 having-a liner for said carton, the'upper portion thereof being highenough to project'beyond said alined fold'lines; whereby when said extensions are folded in wardly, adjacent portions of the liner are folded inwardly, said flaps being i drawn downward, causing said upper portion to bejfeceived between said inner fold line and the inner flap, against the outer margin of the outer flap andfoldable with said outer marginalong the alined fold lines to a position under the outer-flap, leaving the latch tongue projected to engageunder said latching edge,

9. A carton. blank comprising main panels and a lap panel; spacing'panels therebetween; inner and outer flaps integrally foldably joining'said main panels respectively; the inner flap being half as wide as the intermediate panels; web extensions substantially as wide as the inner flap integrally foldably-joining the ends of the inner and outer flaps and the respective spacing panels, and each being .diagonally traversed by weakened lines extending'from the respective inner corners of the web and flaps; the inner fiap being provided near its mid-part with a slitiorming a longitudinal latch edge near the inner edge of.

the inner flap; the outerflapbeing wider than the intermediate fpanels and provided with a longitudinal inner fold line and at the midportion of its free, margin with a slit having a longitudinalportion and angularly turned ends turned toward'the inner edge of the flap to form a longitudinal latch tongue; the outer fiap having alinedlongitudinal fold lines joining the ends'of theslit. g

10. A blank as in claim 9 having a thin pliable rectangular liner adhered on the blank and extending throughout the inner margin of, the lap, and beyond said extensions and alined fold lines.

11. A carton having opposite panels having inner and outer-'fiapsjoined'thereto, the outer flap having"a;fold line remote from the panel; and a liner for said cartonvthe upper portion of the liner being adapted to exten'd'beyond said fold line; the outer margin of the outer flap and said upper portion being folded along 'said fold line to a position under the outer flap with the fold of the upper portion between said margin and the outer flap.

12. A carton comprising opposite mainpanels; spacing panels therebetween; innerand outer flaps foldably joining the main panels, the'inner,

flap being adapted to extend half across they carton; 'web extensions foldably joining the ends linesjoining the'ends of the slit, whereby the margin may be turned under the flap, leaving the latch projected; and a'thin pliable liner for said carton of the approximate shape of the interior 'of the carton and engagingthe walls thereof, the upper portion of the liner being high enough at all sides to project beyond said alined fold lines when the flaps are upright,

13. A reclosable'paper cartoncomp'rising oppo-- site main panels; spacing panelstherebetween; inner and outer flaps'foldably joining said main panels respectively; web extensions foldablyjoin ing the inner flap and therespe'ctive spacing panels, and eachdiagonally traversed by a weak ened line extending from the inner corner of the inner flap, wherebytheweb folds inwardly to form a resilient support-under the-flaps; said flaps being respectively provided near the mid-portion of the inner flap with interengaging" latching means adapted to snap into latching engagementwith each other when the mid-portion of the free edge of outer flap is sufliciently pressed down-' wardly and the inner flap is suificiently thereby depressed.

14. A reclosable paper carton comprising oppopanels respectively,

site .main panels; spacing'panels therebetween;

inner and 'outer flaps foldably joining 'said main panels respectively; web extensions foldably joining the inner flap and the respective spacing panels, and each diagonally traversed by a weakened line extending from the inner corner of the inner flap, whereby the web folds inwardly to Iorma support under,,the flaps; said flaps respectively being provided near the mid-portion of the inner flap with interengaging latching means adaptedto snap into latching engagement with each other when the mid-portion of the 15. A paperboard box comprising an outer flap flap portions adjacent to the fold line; and a liner for said box having a closure portion received against the inner. face of the outer flap; said closure portion and one flap portion being folded together along the fold line in a position under the other flap portion.

ARTHUR J. WEISS. HARRY J. ROSSI.

having a fold line dividingsaid fiap into outer 

